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MEDIUM severity

Improper Verification of Communication Channel in @theia/plugin-extGHSA-w6v7-w58j-pg5r

MEDIUMFix: eclipse-theia/theia#10125

GHSA-w6v7-w58j-pg5r is a medium-severity (CVSS 6.1) CWE-940 vulnerability in @theia/plugin-ext. 1 public exploit reference exists, so weaponization risk is real. A fix is available for @theia/plugin-ext — see the affected versions and patch details below.

Also known asCVE-2021-41038
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs53th percentile — riskier than 53% of all scored CVEsHighest risk
0.00%0.41%0.82%1.24%0.1%0.7%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-w6v7-w58j-pg5r by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

17other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
@theia/plugin-extnpm
17Kdownloads / week

Description

In versions of the @theia/plugin-ext component of Eclipse Theia prior to 1.18.0, Webview contents can be hijacked via postMessage().

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npm@theia/plugin-extall versions1.18.0npm install @theia/plugin-ext@1.18.0

Affected Products

1 product · 1 configurations
Application
theiaeclipse
< 1.18.0
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

In versions of the @theia/plugin-ext component of Eclipse Theia prior to…

bugs.eclipse.orgNVDNov 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @theia/plugin-ext, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update @theia/plugin-ext to 1.18.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-w6v7-w58j-pg5r is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

In versions of the @theia/plugin-ext component of Eclipse Theia prior to 1.18.0, Webview contents can be hijacked via postMessage().
O3 Security · Impact-Aware SCA

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